APA (7th ed.) Citation

Enriques, F., & Phalen, H. R. (1932). Lessons in projective geometry. printed by the translator.

Chicago Style (17th ed.) Citation

Enriques, Federigo, and Harold Romaine Phalen. Lessons in Projective Geometry. Annandale-on-Hudson, N.Y.: printed by the translator, 1932.

MLA (8th ed.) Citation

Enriques, Federigo, and Harold Romaine Phalen. Lessons in Projective Geometry. printed by the translator, 1932.